body {
  overflow: auto;
}
table {
  width: 100%;
  height: 100%;
  margin: 0%;
  padding: 0%;
  background-color: #DDDDDD;
}
td {
  vertical-align: top;
}
td.preview {
  height: 64%;
  width: 49.5%;
  padding: 4px;
}
iframe {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
  border: none;
  background-color: white;
}